The exploits of the Great Brain of Adenville, Utah, are described by his younger brother, frequently the victim of the Great Brain's schemes for gaining prestige or money.

In 1896 the Great Brain of Adenville, Utah, is almost twelve years old and more mischievous than ever in his practical jokes and schemes against everyone in town.

In turn-of-the-century Mormon Utah, Tom's great brain comes up with eight more schemes, most of them concerned with earning money.

In turn-of-the-century Mormon Utah, The Great Brain struggles to stay reformed now that his friends have threatened to ostracize him if he pulls even one more swindle.